| 摘要 |
<p>A track-mounted lighting fixture including a track mounting device having a split extended from a horizontal top mounting channel to an outer thread thereof, a lock nut threaded onto the outer thread, and a connector to connect a lamp holder to the track mounting device, whereby the pitch is enlarged for allowing the track mounting device to be mounted on an overhead track as the lock nut is turned in one direct; the pitch is shortened for allowing the track mounting device to be firmly retained to the overhead track as the lock nut is turned in the reversed direction.</p> |
